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प्रश्न
Describe the T.S. of human testis
Describe the histology of ‘human testis’.
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उत्तर १
Externally, each testis is covered by three layers. These are:
a. Tunica vaginalis:
It is the outermost incomplete peritoneal covering made up of connective tissue and
epithelium.
b. Tunica albuginea:
It is the middle layer formed by fibrous connective tissue.
c. Tunica vasculosa:
It is the innermost layer formed of delicate connective tissue, supporting a network of blood capillaries.
ii. Each testis contains about 200-300 tubules called seminiferous tubules.
iii. These are lined by a single layer of cuboidal germinal epithelium which undergo
spermatogenesis.
iv. In the germinal epithelium, various stages of spermatogenesis such as spermatogonia,
primary spermatocytes, secondary spermatocytes, spermatids and sperms are seen.
v. Between these cells, few large and pyramidal cells called nurse cells or sertoli cells are
present.
vi. Bundles of sperms are seen attached to Sertoli cells.
vii. These cells provide nourishment to the sperms till maturation.
viii. In between seminiferous tubules, connective tissue containing blood vessels, nerves, lymph vessels
and groups of interstitial cells (Cells of leydig) is present.
ix. Interstitial cells produce male hormone testosterone.
उत्तर २
Histology of Testis : -
The testis is externally covered by fibrous connective tissue called Tunica albuginea. It is covered internally by Tunica vasculos which is formed by capillaries. Externally it is covered by the incomplete peritoneal covering called as Tunica vaginalis.
1) The Transverse section shows the presence of seminiferous tubules lined by cuboidal germinal epithelial cells. The germ cell undergoes the process of spermatogenesis
2) The transverse section also reveals different stages of spermatogenesis like spermatogonia, primary and secondary spermatocyte, spermatids and sperm.
3) Few large pyramidal cells present between germinal cells are known as Sertoli cells or Nurse cells. The function of Sertoli cells is to provide Nourishment of the sperm till maturation.
4) Between the seminiferous tubules, are the present cluster of polygonal cells known as Interstitial cells or Leydig cells. The Leydig cells secrete male sex hormone Testosterone or Androgen
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संबंधित प्रश्न
Why is it important that a very large number of sperms should be present in the semen ?
List the structures, in their correct sequence, through which the sperms must pass from the time they are produced in the testes to the time they leave the urethra.
Given on the right is a diagram which represents the reproductive organs of a man:
(i) Write the names of the parts numbered 1 to 16.
(ii) Give two functions of the part 6.
(iii) Name three components of the fluid which may be found in the tube labeled 2.
(iv) What is the main function of the part labelled 3?
Given below is the schematic diagram of the sectional view of the human male reproductive system.
State the functions of the parts numbered 1, 2, 3, 5, 8 and 11.
Draw a label diagram.
Draw a labeled diagram to show the interrelationship of four accessory ducts in a human male reproductive system.
Name the Following
The tubular knot fitting like a cap on the upper surface of the testes.
Write the functional activity of the following structure:
Cowper’s gland
How is the semen produced?
Match between the following representing parts of the sperm and their functions and choose the correct option.
| Column A | Column B | ||
| A. | Head | i. | Enzymes |
| B. | Middle piece | ii. | Sperm motility |
| C. | Acrosome | iii. | Energy |
| D. | Tail | iv. | Genetic material |
State very briefly the chief function of the following:
Prostate gland
